Verb ing' A gerund is a type of noun that is formed from a verb by adding the suffix '-ing'. It is used to describe an action or activity, and can be used as the subject or object of a sentence. For example, 'Running is good exercise' or 'I enjoy running'. The crossword solutions for the term GERUND are NOUN (4 letters) 'Verb ing', which means that a gerund is a noun that is formed from a verb by adding the suffix '-ing'.